Declare support for type checking

[AlexanderRitter02]

Suggesting to make your package type checking compatible by declaring it explicitly (PEP 561).
Would be very useful so it can be used with MyPy.

From what I have seen, you already have type annotated your code, which probably means that you only have to declare it using a py.typed marker.

Package maintainers who wish to support type checking of their code MUST add a marker file named py.typed to their package supporting typing.

I am not familiar with this, so I can't say for sure, but hopefully it would only be a small change. I don't want to impose a big effort on you, so please feel free to ignore if this change would be too big.

Information on this:

• PEP 561: https://peps.python.org/pep-0561/
• MyPy info page for package authors: https://mypy.readthedocs.io/en/stable/installed_packages.html#creating-pep-561-compatible-package